Best available cop



BEST AVAU-ILE CGP".

W. A. MORRISON AND F. D. LAKE.

ELECTRIC HEATER.

APPLICATION FILED ocT. 4. 1920.

PatentedSept. 6, 1921.

l a .5., v

INVEN'TORS. WILLIAM AMoRRIsoN, FREDERICK D. LAKE.

FIC-ILL lincoln, in the Province 'oiOlntariq Canada Y adaptable r.for .use .xiiil lhot ivater ,b Awhich theeleetiic lenient l5v Fig. .2 is a lon WILLIAM ANDREW'MORRISON Nuria-Eiwitten Damiana LAKE,

on'ranidV-feANADA," n

To ZZ 'wheat concern f Be itz known @th yt ive', I MORRISON and Fiiiinnnicfii,A Diinfiiiiin of the citylofSt. Catherines jin thecount of have invented,certain new and useffulj''iii ,.provements: in EleetriciHeaters, ofwhich the following isthe.specificatioii.I l

i, .Qur invention .relates to Iimprove'mei. s fin electric heaters .'andthel; xobject of the i veiltion isf'to- ,devise fa 'siniplgleheap con/ip aet, highly etlicientf'rin 'o'fllife'atei' vpai ou'larly ilerfs'in 'mayibe qL and easily removed for v.thief purpose te repair Without damage tof'fany' 'partof 'the i heater auditconsists essentially :offth'e following arrangement and construetio'i`i of parts as hereinafter morefparticularlyfeiiplained.

F'gure 1 is a showing our eleetric'heater in plarcef" l thro-ugh'. our `heater@inteririediately` away of its length.

Fig. 3 pis a sectional vView lon line r3--3 y Y Y )inner @iid-s951111 Fig. 4 is a sectional view on'line`4-4 looking at the end ot' the electric element.

Fig. 5 is a detail of the core forming the base of our electric ele-nient intermediately broken away of its length.

In the drawings like characters ot reference indicate the corresponding parts in each ligure.

l indicates a boiler which is filled in the usual manner with Water 2. 3 indicates an internally threaded orifice into which our electric heater is adapted to be screwed so as to extend diametrically across the boiler l. 4 indicates a cylindrical casing, the exterior surface of Which is provided with a square thread 5 cut therein extending troni end to end. The purpose of this thread is to prevent the deposits from the Water from permanently coating the heater casing and destroying the efficiency7 of the heater. By providing a square thread as indicated, the expansion or contraction of the cylinder as the Water becomes hot or cold serves to scale oil' these deposits by reason of the surfaces of the thread extending at right angles one to the other` 7 is a closing cap screwed or otherwise suitably secured to the open end of the casing. The cap 7 is provided with sectional-,plan vie'wof Llooiler ditudinal sectional "view .OF ST. CATHERINES,

Yagma-RIC 'ma 1 l .i Paten-tea spt- 6, 1.92.1.-

4, 1920. SerialliNo.

y :ign-indicates corset lsoapstone or othery ma- "t'e'ial 'adapted'to absorb and maintain heat to ,v a; maximum nextent. The.y core is ,cylindrical y,tlie'ie'iiiftj'contaiiifwindings of the elemeii 2 ,Qand2lfin icateli'jecesses in the Qut'ereiid the cor I1d' extendinglo'ngitudin'ally the lipe'if end of one eoiivou tliejother con- Volutidnopehing' tothe. recess 21.. 22 and ZB'HiIndicate the copper leading in jWires orifices 24: and Q5 i; formed I y f esQQaIidLQSKeXt-end into Ithe recesses- 20"a d"2l`. f 29 indicatesy the Winding of my heat element and is formed of nichrome Wire. .One end ot the wire extends from the recess Q0 and passes longitudinally of the core through one convolution of the double thread to the inner end ot the core and then extends through the diametrically extending groove 26 to the opposite side of the core and there enters the other convolution ot the double thread passing longitudinally through suoli convolution to the recess 21.

lt will thus he seen that hy this ari-angremcnt that the turns etl that portion ot the Wire leading in are arranged alternately to that portion of wire leading out. The wires 22 and Q3 are connected to the ends ot' the Wire 24; by suitable coupling sleeves 2T and 2S which are embedded in a filling of dielectric. cement 30 contained in the recesses Q0 and 2l. The cap 7 mayv be threaded or other- Wise suitably secured to the casing 4 or attached by any other means permitting their easy and quick separation to enable the electric element 1S being` Withdrawn for the purpose of repair when necessary.

From this description it will be seen that We have devised a very simple, cheap, easily of .the The 19( @perline ,into the 'ndouble BEST AVAL-LE COPE installed electric water heater particularly adaptable for use in a domestichot Water boiler and which may be easily andquickly repaired Whenever it becomes necessary and which will produce a very high temperature and therefore is eficient and at the same time is compact, taking up no space outside of the boiler such as is common with ordinary electric Water heaters.

What We claim as our invention is.

l. An electric Water heater comprising a cylindrical casingl of heat. conducting ma` terial adapted'to be inserted in an orifice. in a boiler Wall and'to extend inwardly into the boiler, a core formed of heat absorbing material fitting Within-the casing and pro vided with a double thread extending longitudinally thereof, and a Windingformed by a wire extending inwardly longitudinally of the core through one member of the double thread and returning outward through the other member of the double thread vand adapted to be secured at its ends to leading in- Wires.

2. In an electricwvater heater, a tubular casing formed of heat conducting material, a removable cap secured 4to the outer end of the casing having orifices for leading in Wires and provided with an external thread, a core of heat absorbing material fitting Within the cylindrical casing and having a thread extending longitudinally thereof, and a diametric groove connecting the inner ends of thel members of the double thread and wire winding adapted to extend inwardly through one member of the double thread through the diametric groove at the inner end of the core and then outward through thel other memberv of the double thread...

3. In an electric Water heater, a cylindrical casi-ng formed of heat conducting material, av removable cap for the casing, a core of heat absorbing material provided Withv a double thread extending longitudinally thereof and atits'inner'endwith a diametric groove connecting the inner ends of the thread and at itsouter end.- with" longitudinal recesses into each ofwhichthe member of'the double thread enters, leading lin Wires extending through the. eapj intovthe, recesses, ,av Wire Winding.' connected at one` end to onev leading in Wire in onezrecess. and. extending longitudinally of the corelthrough one member of the double thread, then through thefdiametric spot, then returning through the vother member 'of`the double'thread into lthe* other V'ILLIAMV ANDREW MORRISON. FREDERICK DELIMER LAKE. 

